Furnace-door-operating device.



No. 780,204. PATENTED JAN. 17, 1905. J. O. LAGERQUIST. FURNACE DOOROPERATING DEVICE.

APPLICATION FILED SEPT. 23, 1904.

% 5314/1901 oz V Cation/Lead UNITED STATES Patented January 17, 1905.

PATENT OEEIcE.

JOHN O. LAGERQUIST, OF HAMILTON, MONTANA.

FURNACE-DOOR-OPERATI NG DEVICE.

SPECIFICATION forming part of Letters Patent No. 780,204, dated January1'7, 1905.

Application filed September 23, 1904. Serial No. 225,649.

To all whom it may concern:

Be it known that I, J OHN O. LAGERQUIST, acitizen of the United States,residing at Hamilton, in the county of Ravalli and State of Montana,have invented new and useful Improvements in Furnace-Door-OperatingDevices, of which the following is a specification.

This invention is a device for opening and closing furnace-doors quicklyand also includes means for holding the door open when desired.

The door is opened by means of foot-pressure on a treadle and is closedby a spring upon release of the treadle, the movement being transmittedby means of gearing and appliances to be hereinafter described.

In the accompanying drawings, Figure 1 is a front elevation of thedevice. Fig. 2 is a side elevation thereof, parts being shown insection. Fig. 3 is a bottom plan view of the mechanism underthe platforReferring specifically to the drawings, 6 indicates the furnace-door,and 7 the platform in front of the furnace. 8 indicates a crank, theupper end of which projects under a strap 9, fixed to the furnace-doorand the lower end of which extends through the platform, under which itis provided with a bevel-gear 10. This crank swings in a horizontalplane and by its swing opens or closes the door.

The bevel-gear 10 referred to on the lower end of the crank is in meshwith a gear on a shaft 12, which is supported in suitable frames on theunder side of the platform. This shaft carries a roller 13, around whichis bent a strap 14:. One end of the strap is connected to a lever 15,which is pivoted at one end to the frame of the platform, as at 16, andis connected at its other end to a treadle-rod 17, which extends upthrough the platform. The other end of the strap 14 is connected to aspring 18.

The treadle-rod is notched, as at 19, and adjacent the hole in theplatform through which the rod works is a plate 20, arranged to engagein the notches.

Normally the spring 18 holds the door closed. To open the door, thetreadle is depressed, which by means of the strap 14 turns the roller 13and with it the shaft on which the said roller is mounted. By means ofthe bevel-gear this motion is communicated to the crank 8, which swingsand throws the door open. If it be desired to hold the door open, thetreadle is pressed laterally to engage the plate 20 in one of thenotches, which holds the parts as set and prevents the spring fromacting. To close the door, the treadle-rod may be released by tap of thefoot, when the spring 18 will pull the strap and turn the roller, shaft,and crank in the opposite direction, thereby closing the door.

N o hand-work is necessary to open or close the door, and the use of theinvention will be found to save time, labor, and fuel and to avoidcooling the furnace by leaving the door open.

What I claim as new, and desire to secure by Letters Patent, is

The combination with a furnace-door, and a platform before the same, ofa crank one arm of which is connected to the door, and the other arm ofwhich extends through the platform, a shaft geared to the crank underthe platform, a laterally-movable notched treadlerod extending throughthe platform, a strap wound on the shaft and connected to the treadle toopen the door, a spring connected to the strap, to close the door, and aplate on the platform, engageable in the notches by lateral movement ofthe rod.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN O. LAGERQUIST.

Witnesses:

DAVID WASTBERG, ROBERT A. OHARA.

